Question

15 POINTS~~:) plssss help add explanation too!!!

Malcolm wants to surprise his mother with a birthday cake when she gets home from work. She gets home from work at 4 p.m. He needs to make the cake batter, which will take 10 minutes; bake the cake, which will take 35 minutes; let it cool for 20 minutes; and then put the icing on, which will take 20 minutes. What time should Malcolm start making the cake to be sure it is finished when his mother gets home from work at 4 p.m.?

O 2:35 am
O 2:15 am
O 2:15 pm
O 2:35 pm

Answer 1

Answer: 2:35 pm

Step-by-step explanation

Add up all of the minutes durations

10+35+20+20 = 85

He needs 85 minutes total.

85 min = 60 min + 25 min = 1 hr + 25 min

His mom gets home at 4 pm. Subtract off 1 hour from this to get 3 pm. Subtract off another 25 minutes to get to 2:35 pm

If it helps, think of the top of the hour as 60 minutes. Subtracting off 25 minutes means 60-25 = 35, showing he should start 35 minutes past the hour.